I was looking for a carabiner with a rounder spine, not I-beam shaped, to use with my ATC Guide in auto-blocking mode, so the rope will run more smoothly around the edge of the biner. This one did the trick and is a really nice blue color as well.

Good carabiner...but it's a Petzl Attache...so that's expected. It feels hefty for an aluminum piece, and the screw lock has a good knurled grip and a red paint stripe that shows when unlocked. It's about the same size as a standard oval or D carabiner, not oversized pear like the Petzl William or BD RockLock. I like it.